Process of obtaining potash and cement clinker.



I S. GELLERL PROCESS OF OBTAINING POTASH AND GEMENTULINKBR. APPLIGATIONFILED MAY 12, 1911.

1,058,686 Patentd Apr. 8, 1913.

, To all'whom, it-may concem:

Be it known that I, Scam GnLL nr, chemist, of Budapest, Austria-Hun ary,have in vented a certain new and use 111 Process of clinker.

STATES PATENT OFFICE. some. German or BUDAPEST,AUS'JltRIA-HUNGARYfASSIGNOR or ONE-HALF T0 vrm. ANTON HAMIBLOCH, orANnERNncH, GERMANY. I

rnocnss or OBTAINIIIG ro'msrr Aunfonmnnr cLmK R.

Obtaining Potash and Cement Clinker, of which the following is aspecification.

Silicates are burned with lime, or generally with an oxid or carbonateof an alkaline earth metal or magnesium for the purpose of opening up ordecomposing the silicate and obtaining potash and cement After thesilicates have been opened up in this manner, however, a large part ofthe alkalis in them is still not in the free condition in which alkaliscan be leached out of the silicates b water; that is to say, thesilicates even a ter they have been burned with .the said oxids orcarbonates always still constitute a combination consisting ofaluminate, silicic acid and alkalis, from which a large part of thealkalis cannot be separated by water.

By the process which constitutes the pres ent invention thisdisadvantage is overcome" by subjecting the silicates in a closedchamher to the action of ammonium carbonate vapor under pressure, eitherafter they have been burned with the said oxids or carbonates or withoutthis preliminary burning. In this manner the silicates are completelyopened up and the whole of the alkalis can be leached out by water asalkali carbonate.

' The opening up takes place in the presence of water vapor and potashfeldspar according to the following equation:

6 (SlggOgAlK) 3 (NIL) C0 nace wherein the silicates are burned withlimestone; in this manner the ammonia op- 'erates continuously as acarrier of carbon dioxid.

In order that a separate heating installation and separate fuel may notbe necessary for heating the silicates with ammonium carbonate, thefurnace gases coming from the burning kiln may be used.

Specification of Letters Patent.

. Application filed May 12, 1911.

vPatented Apr.'8, 1913.

Serial no. 52 ,732. I

a If .the silicates have been burned with lime before being. treatedwith ammonium carbonate they contain all the'constit-uentscorresponding. with the composition of Portland cement, so that it ispossible to burn the silicates which have been opened up and freed fromalkalis, to Portland cementby again heating them.

'The method of carrying out the operationin ractice will now bedescribed with the ai of the accompanying drawing, which representsinelevation an apparatus suitable for carrying out the process accordingto this invention.

A mixture of three parts by weight of limestone and one part by weightof feldspar is passed in a finely divided condition from a container ainto a rotary furnace e, which is supplied at the opposite end withpowdered carbon from a container 7) -A temperature of 1200-1300 G. ispreferably maintained in the furnace, that is generally such atemperature, that a pulverulent, friable mass isformed from the mixture,without its being converted into glass. The burnt mass slides from thefurnace through the socket s into a cooling vessel not shown in thedrawing, through which the air, which is to be forced through the piped, passes in the opposite direction, so as to be heated beforehand. Themass is then led in any suitable manner from the cooling vessel into thevessels '9 and h, which are used alternately, and in which the mass is.heated up to about 100105 C. with ammonium carbonate vapor introducedthrough the pipes r and t at about 10-12 atmospheres pressure.

For the purpose of recovering the ammonium carbonate the carbondioxid isdrawn off from the, rotary oven e and led into acondenser 1' into whichthe ammonia isled alternately from the vessels 9 and h through the-pipesm and n after the silicates have been opened up the ammonium carbonateformed here is collected in a reservoir and the sludge of the opened upmass pumped through the ipes is into a filtering device The liquiflowing from the sludge in the filter contains the alkalis and isevaporatedto recover these. In order to use the heat of the rotary ovento warm the vessels 9 and h, the carbon dioxid coming from the rotaryoven is led from the oven 6 through the pipe 0 around the vessels 9 andh in spiral tubes before entering the condenser. Care must be taken thatthe temperature of the gases in the Condenser remains under 40 C. inorder to form ammonium carbonate. The pipes leading to the opening upvessels are provided with suitable valves.

What I claim and desire to secure by Letters Patent of the United Statesis:

1. Process of obtaining potash and cement clinker, which processcomprises first burning silicates containing alkali metal compounds with'a salt of an alkaline earth-metal, then introducing them into a closedchamber,

.monium carbonate vapor under high presthen subjecting them to theaction of amsure, then bringing the ammonia liberated during thissubjection into contact with carbon dioxid evolved in the aforesaidburning operation so as to form ammonium carbonate, and finally heatinga further quantity of burned silicates with the vapor of the last-namedammonium carbonate.

2. Process of obtaining potash and cement clinker, which processcomprises first burningsilicates containing alkali metal compounds withan alkaline earth metal, then introducing them into a clpsed chamber andfinally heating them with ammonium carbonate vapors under high pressureby means of the gases produced in burning the silicates.

3. The process of obtaining potash and cement clinker, which processcomprises first burning silicates containing alkali metal compounds witha salt of an alkaline earth metal, then introducing them into a closedchamber and finally subjecting them to the action of ammonium carbonatevapors ,under high pressure.

4. The process of obtaining potash and cement clinker, which processconsists in first burning silicates containing alkali metal compoundswith a salt of an alkaline earth metal, then introducing them into aclosed chamber, then subjecting them to the action of ammonium carbonatevapors under high pressure, then leaching them so as to remove thealkalis, and finally burning them again.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

SOMA GELLERI'.

WVitnesses:

E. P. KELEMENT, H GH KENEIRY.

